You don't have to set it to static, but occasionally DHCP might give you a new IP address if you have a few things on your LAN and shut them all down and your router at the same time and restart them in a different order.
Open a command prompt (start>program files>accessories>command prompts) and type "ipconfig" and make sure it matches what IP you are forwarding the ports to in your router. Also, if this has never worked for you in the past, you might want to make sure you are setting port RANGE forwarding and not just port forwarding. If you are setting port forwarding, it is actually sending anything that is destined for port 7000 to port 7100 instead, which won't work at all.
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